WO2023236218A1 - 圆柱电池单体、电池以及用电装置 - Google Patents

圆柱电池单体、电池以及用电装置 Download PDF

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Publication number
WO2023236218A1
WO2023236218A1 PCT/CN2022/098262 CN2022098262W WO2023236218A1 WO 2023236218 A1 WO2023236218 A1 WO 2023236218A1 CN 2022098262 W CN2022098262 W CN 2022098262W WO 2023236218 A1 WO2023236218 A1 WO 2023236218A1
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WO
WIPO (PCT)
Prior art keywords
wall portion
battery cell
cylindrical battery
wall
thickness
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2022/098262
Other languages
English (en)
French (fr)
Inventor
程兴
陈威
伍永彬
牛少军
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Contemporary Amperex Technology Co Ltd
Original Assignee
Contemporary Amperex Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Contemporary Amperex Technology Co Ltd filed Critical Contemporary Amperex Technology Co Ltd
Priority to CN202280077586.4A priority Critical patent/CN118251795A/zh
Priority to EP22945359.2A priority patent/EP4418415A4/en
Priority to PCT/CN2022/098262 priority patent/WO2023236218A1/zh
Publication of WO2023236218A1 publication Critical patent/WO2023236218A1/zh
Priority to US18/779,131 priority patent/US20240380038A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/131—Primary casings; Jackets or wrappings characterised by physical properties, e.g. gas permeability, size or heat resistance
    • H01M50/133—Thickness
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/147—Lids or covers
    • H01M50/166—Lids or covers characterised by the methods of assembling casings with lids
    • H01M50/169—Lids or covers characterised by the methods of assembling casings with lids by welding, brazing or soldering
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0422—Cells or battery with cylindrical casing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0431—Cells with wound or folded electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/107—Primary casings; Jackets or wrappings characterised by their shape or physical structure having curved cross-section, e.g. round or elliptic
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/147—Lids or covers
    • H01M50/148—Lids or covers characterised by their shape
    • H01M50/152—Lids or covers characterised by their shape for cells having curved cross-section, e.g. round or elliptic
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
    • H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
    • H01M50/213—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for cells having curved cross-section, e.g. round or elliptic
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the present application relates to the technical field of battery manufacturing, specifically, to a cylindrical battery cell, a battery and an electrical device.
  • this application proposes a cylindrical battery cell, battery and electrical device.
  • the casing and end cover of the cylindrical battery cell have good welding quality, thus having high safety performance.
  • the first embodiment of the present application proposes a cylindrical battery cell, including: a casing, the end of the casing along the first direction having an opening; an end cover covering the opening; wherein, the casing It includes a side wall, the side wall includes a first wall part and a second wall part arranged along the first direction, the second wall part is located on a side of the first wall part close to the opening, so The thickness of the second wall part is greater than the thickness of the first wall part, and the second wall part is welded to the end cap.
  • the second wall portion when the second wall portion is welded to the end cover, since the thickness of the second wall portion is greater than the thickness of the first wall portion, the surface of the second wall portion facing the end cover faces directly The area of the end cover is larger, so that the case has enough area to be welded to the end cover, which improves the welding quality of the case and the end cover, and improves the assembly qualification rate and safety performance of the cylindrical battery cells.
  • the second wall portion has a first surface, the first surface is welded to the end cover, and the first surface is a deflection of the housing in the first direction. An end face.
  • the area of the first surface facing the end cover is larger, so that there is enough area for welding connection with the end cover, which improves the welding quality of the housing and the end cover.
  • the end cap includes a body part and an edge part, the edge part is arranged around the body part, the thickness of the edge part is smaller than the thickness of the body part, and the edge part is connected with the body part.
  • the first surface is welded and connected, and along the first direction, the projection of the outer edge of the edge portion falls into the first surface.
  • the projection of the outer edge of the edge portion falls into the first surface, that is, the surface of the edge portion facing the first surface is at least partially opposite to the first surface, so that the first surface and the edge are aligned
  • the parts are reliably welded together, which improves the welding quality of the shell and the end cover.
  • the second wall portion protrudes from an inner surface of the first wall portion.
  • the second wall protrudes from the inner surface of the first wall, which not only increases the thickness of the second wall, but also reduces the protrusion of the second wall from the outside of the first wall at the same thickness.
  • the degree of the surface reduces the increase in the external volume of the cylindrical battery cell due to the increase in the thickness of the second wall portion, and improves the energy density of the cylindrical battery cell.
  • the outer surface of the first wall part is flush with the outer surface of the second wall part.
  • the thickness of the second wall part is greater than the thickness of the first wall part without increasing the thickness of the cylindrical battery cell. external volume, thereby increasing the energy density of the cylindrical battery cells.
  • the second wall portion protrudes from the outer surface of the first wall portion.
  • the second wall portion protrudes from the outer surface of the first wall portion, which can not only increase the thickness of the second wall portion, but also reduce the protrusion of the second wall portion from the inner surface of the first wall portion at the same thickness.
  • the degree of the surface reduces the narrowing of the opening of the cylindrical battery cell due to the increase in the thickness of the second wall, making it easier for the electrode assembly to be placed inside the case, which facilitates the assembly process of the cylindrical battery cell.
  • the inner surface of the first wall part is flush with the inner surface of the second wall part.
  • the thickness of the second wall is greater than that of the first wall while maintaining the original opening of the cylindrical battery cell.
  • the small external volume makes it easy to put the electrode assembly inside the case, which is convenient for the assembly process of cylindrical battery cells.
  • the second wall portion includes a base portion and a transition portion, the transition portion is connected between the base portion and the first wall portion in a direction away from the base portion, The thickness of the transition portion gradually decreases.
  • the thickness of the transition portion gradually decreases from the base portion toward the first wall portion to achieve a gentle transition in thickness from the base portion of the housing to the first wall portion, which not only makes the outer surface of the housing and / Or the inner surface extends smoothly to reduce the possibility of the shell scratching the electrode assembly or the staff. It can also prevent the connection between the base part and the first wall part from reducing the structural strength due to a sudden decrease in thickness, thereby reducing the structural strength of the shell. The strength is roughly uniform, which improves the safety performance of the cylindrical battery cells.
  • the outer surface of the base part is flush with the outer surface of the transition part, and the inner surface of the transition part is inclined relative to the inner surface of the base part.
  • the outer surface of the base part is flush with the outer surface of the transition part, which does not increase the outer volume of the cylindrical battery cell and can improve the energy density of the cylindrical battery cell;
  • the inner surface of the transition part is relative to the base part
  • the inner surface of the battery is inclined to make the inner surface of the casing extend smoothly, reducing the possibility of the casing scratching the electrode assembly and improving the safety performance of the cylindrical battery cell.
  • the second wall portion extends in a circle along the circumference of the housing.
  • the thickness of the second wall portion in the circumferential direction of the casing is greater than the thickness of the second wall portion, the surface of the second wall portion facing the end cap can be made to face the surface of the end cap in the circumferential direction of the casing.
  • the areas are larger, and the welding quality of the shell and the end cover in the circumferential direction of the shell is better.
  • the thickness of the first wall portion is H1
  • the thickness of the second wall portion is H2, satisfying 0.01mm ⁇ H2-H1 ⁇ 1mm.
  • the relationship between the thickness H1 of the first wall part and the thickness H2 of the second wall part satisfies the above range, which can increase the thickness of the second wall part relative to the first wall part and make the second wall part and the second wall part.
  • the end caps are reliably welded and connected, and the variation range of the thickness of the connection between the first wall part and the second wall part can be smaller, so that the structural strength of the shell is relatively uniform.
  • the length of the second wall portion is L, satisfying 1 mm ⁇ L ⁇ 10 mm.
  • the length L of the second wall along the first direction satisfies the above range, which means it has a sufficient length in the first direction and reduces the possibility of softening and deformation due to heat generated during the welding process of the second wall and the end cap. It can also reduce the length ratio of the second wall portion to the first wall portion in the first direction, making the total weight of the case thinner and meeting the lightweight requirements of the cylindrical battery cells.
  • the cylindrical battery cell further includes: an electrode assembly accommodated inside the housing, a winding axis of the electrode assembly extending along the first direction, and the second wall
  • the inner diameter of the electrode assembly is D1
  • the outer diameter of the electrode assembly is D2, which satisfies D1-D2 ⁇ 0.1mm.
  • the relationship between the inner diameter D1 of the second wall and the outer diameter D2 of the electrode assembly satisfies the above range, which facilitates the smooth placement of the electrode assembly into the interior of the case from the opening and facilitates the assembly process of the cylindrical battery cells.
  • the opening is formed at two opposite ends of the housing along the first direction, two second wall portions are provided, and the two second wall portions are located on the Two end caps are provided on both sides of the first wall, and the end caps correspond to the openings one by one.
  • the two ends of the casing along the first direction are respectively welded and connected to one end cover, and the two ends of the casing along the first direction are respectively provided with second wall portions to improve the connection between each end cover and the casing. welding quality.
  • the second embodiment of the present application provides a battery, including the cylindrical battery cell described in the first embodiment of the present application.
  • the battery according to the second embodiment of the present application also has better safety performance.
  • the third embodiment of the present application provides an electrical device, including the battery described in the second embodiment of the present application, where the battery is used to provide electric energy.
  • the electrical device according to the third embodiment of the present application also has better safety performance.
  • Figure 1 shows a simple schematic diagram of a vehicle in an embodiment of the present application
  • Figure 2 shows a schematic structural diagram of the battery of the vehicle in Figure 1;
  • Figure 3 shows a schematic structural diagram of a first form of cylindrical battery cell according to some embodiments of the present application
  • Figure 4 shows an internal structural diagram of the cylindrical battery cell shown in Figure 3 (the electric energy output part and current collecting member are not shown);
  • Figure 5 shows an internal structural diagram of a second form of cylindrical battery cell according to some embodiments of the present application (the power output part and current collection component are not shown);
  • Figure 6 shows a partial enlarged view of position A in Figure 5 (the electrode assembly is not shown);
  • Figure 7 shows a schematic structural view of the casing of the cylindrical battery cell shown in Figure 5;
  • Figure 8 shows a partial structural schematic diagram of the casing of a third form of cylindrical battery cell according to some embodiments of the present application.
  • Figure 9 shows a partial structural diagram of a fourth form of cylindrical battery cell according to some embodiments of the present application.
  • Figure 10 shows a schematic diagram showing the relationship between the inner diameter of the second wall and the outer diameter of the electrode assembly in a cylindrical battery cell according to some embodiments of the present application;
  • Figure 11 shows a schematic diagram of the connection between the end cap and the case showing poor roundness in the cylindrical battery cell according to some embodiments of the present application
  • Figure 12 shows a schematic diagram of the connection between the end cap and the housing that exhibits poor roundness in the prior art
  • Icon 1000-vehicle; 100-battery; 10-cylindrical battery cell; 11-casing; 111-side wall; 112-opening; 1121-first opening; 1122-second opening; 113-bottom wall; 114- First wall part; 1141-first inner surface; 1142-first outer surface; 115-second wall part; 1151-first surface; 1152-second inner surface; 1153-second outer surface; 1154-base part ; 1155-transition part; 11551-third inner surface; 11552-third outer surface; 1156-first gap; 116-welding area; 12-end cover; 121-body part; 122-edge part; 1221-second Surface; 123-first end cap; 124-second end cap; 13-electrode assembly; 131-main body; 132-first tab; 133-second tab; 14-first electric energy output part; 15-set Flow component; 20-box; 21-first sub-box; 22-second sub-box; 200-controller; 300-motor;
  • an embodiment means that a particular feature, structure or characteristic described in connection with the embodiment may be included in at least one embodiment of the application.
  • the appearances of this phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.
  • connection should be understood in a broad sense.
  • it can be a fixed connection or a fixed connection.
  • connection can be a fixed connection or a fixed connection.
  • detachable connection, or integral connection it can be directly connected, or indirectly connected through an intermediate medium, or it can be internal connection between two components.
  • “Plural” appearing in this application means two or more (including two).
  • the battery cells may include lithium ion secondary batteries, lithium ion primary batteries, lithium-sulfur batteries, sodium lithium ion batteries, sodium ion batteries or magnesium ion batteries, etc., which are not limited in the embodiments of this application.
  • the battery mentioned in the embodiments of this application refers to a single physical module including one or more battery cells to provide higher voltage and capacity.
  • the battery mentioned in this application may include a battery module or a battery pack.
  • Batteries generally include a box for packaging one or more battery cells. The box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.
  • the battery cell includes an electrode assembly and an electrolyte.
  • the electrode assembly consists of a positive electrode plate, a negative electrode plate and a separator. Battery cells mainly rely on the movement of metal ions between the positive and negative electrodes to work.
  • the positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer.
  • the positive electrode active material layer is coated on the surface of the positive electrode current collector.
  • the positive electrode current collector that is not coated with the positive electrode active material layer protrudes from the positive electrode collector that is coated with the positive electrode active material layer. Fluid, the positive electrode current collector without the positive electrode active material layer is used as the positive electrode tab.
  • the material of the positive electrode current collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganate, etc.
  • the negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer.
  • the negative electrode active material layer is coated on the surface of the negative electrode current collector.
  • the negative electrode current collector that is not coated with the negative electrode active material layer protrudes from the negative electrode collector that is coated with the negative electrode active material layer.
  • Fluid, the negative electrode current collector that is not coated with the negative electrode active material layer is used as the negative electrode tab.
  • the material of the negative electrode current collector can be copper, and the negative electrode active material can be carbon or silicon.
  • the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together.
  • the material of the separator can be PP (polypropylene, polypropylene) or PE (polyethylene, polyethylene), etc.
  • the battery cell also includes a current collecting member and an electric energy output part.
  • the current collecting member is used to electrically connect the tabs of the battery cell and the electric energy output part of the same polarity to transport electric energy from the electrode assembly to the electric energy output part.
  • the output part is transported to the outside of the battery cell.
  • the electric energy output part can be an electrode terminal, or the end cover of the battery cell or the bottom wall of the casing; multiple battery cells are electrically connected through bus components to achieve Series, parallel or mixed connection of multiple battery cells.
  • the casing and the end cover are welded and connected. Since the casing and the end cover inevitably have manufacturing tolerances, the contours of the opening edge of the casing and the edge of the end cover may deviate, resulting in The end cap cannot completely cover the opening, resulting in poor welding quality between the housing and the end cap.
  • the laser moves along the circumferential direction of the casing, the laser is likely to penetrate into the interior of the casing and burn the electrode components inside the casing. This may damage the electrode components and reduce the safety performance of the battery cells.
  • the casing and the end cover need a sufficient facing area to achieve good welding between the two.
  • the facing area of the casing and the end cover in the axial direction of the cylindrical battery cell can be increased or the roundness of the opening can be optimized, the welding quality of the casing and the end cover can be significantly increased and the assembly quality of the cylindrical battery cell can be improved. efficiency and safety performance.
  • the housing includes a first wall portion and a second wall portion arranged along its axial direction.
  • the second wall portion is located on the side of the first wall portion close to the opening.
  • the thickness of the second wall part is greater than the thickness of the first wall part, and the second wall part is welded to the end cap. Since the thickness of the part of the shell close to the opening is increased, on the one hand, the area of the second wall facing the end cover can be increased, providing a larger error range for assembly and manufacturing, and on the other hand, the strength of the shell opening can be increased.
  • cylindrical battery cells described in the embodiments of the present application can directly supply power to electrical devices, or they can be connected in parallel or in series to form batteries to power various electrical devices in the form of batteries.
  • the electrical devices that use cylindrical battery cells, battery modules or batteries described in the embodiments of the present application can be in various forms, such as mobile phones, portable devices, laptops, battery cars, electric vehicles, and ships.
  • spacecraft, electric toys and electric tools, etc. for example, spacecraft include airplanes, rockets, space shuttles, spaceships, etc.
  • electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, Electric ship toys and electric airplane toys, etc.
  • Power tools include metal cutting power tools, grinding power tools, assembly power tools and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills , concrete vibrators and planers.
  • cylindrical battery cells and batteries described in the embodiments of the present application are not limited to the above-described electrical devices, but can also be applied to all electrical devices using cylindrical battery cells and batteries. However, for the sake of simplicity of description, the following The embodiments are all described by taking an electric vehicle as an example.
  • FIG. 1 shows a simple schematic diagram of a vehicle in an embodiment of the present application
  • FIG. 2 shows a schematic structural diagram of the battery of the vehicle in FIG. 1 .
  • a battery 100 , a controller 200 and a motor 300 are disposed inside a vehicle 1000 .
  • the battery 100 may be disposed at the bottom, front or rear of the vehicle 1000 .
  • the vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc.
  • the battery 100 may be used to power the vehicle 1000 , for example, the battery 100 may be used as an operating power source for the vehicle 1000 .
  • the controller 200 is used to control the battery 100 to provide power to the motor 300, for example, to meet the power requirements for starting, navigation and driving of the vehicle 1000.
  • the battery 100 can not only be used as an operating power source for the vehicle 1000 , but can also be used as a driving power source for the vehicle 1000 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000 .
  • the battery 100 mentioned in the embodiment of the present application refers to a single physical module including one or more cylindrical battery cells 10 to provide higher voltage and capacity.
  • multiple cylindrical battery cells 10 can be connected in series, parallel or mixed connection to directly form the battery 100.
  • Mixed connection means that the multiple cylindrical battery cells 10 are both connected in series and in parallel.
  • Multiple cylindrical battery cells 10 can also be connected in series, parallel or mixed to form a battery module, and then multiple battery modules can be connected in series, parallel or mixed to form the battery 100 .
  • the battery 100 includes a plurality of cylindrical battery cells 10 and a box 20 .
  • the plurality of cylindrical battery cells 10 are placed in the box 20 .
  • the box 20 includes a first sub-box 21 and a second sub-box 22.
  • the first sub-box 21 and the second sub-box 22 are covered with each other to form a battery cavity.
  • a plurality of cylindrical battery cells 10 are placed in the battery cavity.
  • the shape of the first sub-box 21 and the second sub-box 22 can be determined according to the combined shape of multiple cylindrical battery cells 10, and the first sub-box 21 and the second sub-box 22 can each have an opening. .
  • both the first sub-box 21 and the second sub-box 22 can be hollow rectangular parallelepipeds and each has only one open surface.
  • the openings of the first sub-box 21 and the second sub-box 22 are arranged oppositely, and the first sub-box 21 and the second sub-box 22 are arranged oppositely.
  • the sub-box 21 and the second sub-box 22 are coupled with each other to form a box 20 with a closed chamber.
  • a plurality of cylindrical battery cells 10 are connected in parallel or in series or in a mixed combination and then placed in a box 20 formed by fastening the first sub-box 21 and the second sub-box 22 .
  • Figure 3 shows a schematic structural diagram of a first form of cylindrical battery cell according to some embodiments of the present application
  • Figure 4 shows an internal structural diagram of the cylindrical battery cell shown in Figure 3 (electric energy is not shown).
  • Figure 5 shows an internal structural diagram of a second form of cylindrical battery cell according to some embodiments of the present application (the electric energy output part and current collecting member are not shown).
  • the cylindrical battery cell 10 includes a casing 11, an end cover, an electrode assembly 13, an electric energy output part and a current collecting component.
  • the number of the electric energy output parts is two, and the two electric energy output parts They are the first power output part 14 and the second power output part (not shown in the figure) respectively.
  • the housing 11 can be cylindrical or elliptical, and the housing 11 can be made of metal materials, such as aluminum, aluminum alloy or nickel-plated steel.
  • the end cap has a plate-like structure, the size and shape of the end cap match the opening of the casing 11 , and the end cap is fixed to the opening of the casing 11 , thereby sealing the electrode assembly 13 and the electrolyte in the accommodation cavity of the casing 11 .
  • the end cap is made of metal materials, such as aluminum, steel and other materials.
  • the housing 11 has a cylindrical shape extending along the first direction P in the axial direction. Along the first direction P, one or both ends of the housing 11 have openings.
  • the number of end caps is corresponding to the number of openings. The end caps cover the corresponding openings. opening to seal the electrode assembly 13 inside the housing 11 .
  • the housing 11 only includes a side wall 111, and both ends of the side wall 111 have a first opening 1121 and a second opening respectively.
  • the number of end caps is two, and the two end caps are a first end cap 123 and a second end cap 124 respectively.
  • the first end cap 123 covers the first opening 1121, and the second end cap 124 covers the second opening 1122.
  • the housing 11 includes a side wall 111 and a bottom wall 113 .
  • the side wall 111 extends around the axis direction of the housing 11 (ie, the first direction P), along the first direction P.
  • one end of the side wall 111 has an opening 112, and the other end is closed by the bottom wall 113.
  • the number of end caps is one.
  • the end cap 12 covers the opening 112, and the end cap 12 matches the shape of the opening 112.
  • the electrode assembly 13 is disposed in the housing 11 .
  • the electrode assembly 13 includes a main body 131 , a first tab 132 and a second tab 133 .
  • the main body 131 includes a positive electrode piece, a negative electrode piece and a separator.
  • the separator is located between the positive electrode piece and the negative electrode piece and is used to separate the positive electrode piece and the negative electrode piece.
  • the electrode assembly 13 is formed by a rolling method.
  • the electrode assembly 13 has a winding center hole, and the winding center hole penetrates the electrode assembly 13 along the first direction P.
  • the first pole tab 132 is a positive pole tab
  • the second pole tab 133 is a negative pole tab
  • the first tab 132 is arranged corresponding to one current collecting member 15
  • the second tab 133 is arranged corresponding to the other current collecting member 15 .
  • the material of the current collecting member 15 corresponding to the first pole tab 132 is aluminum
  • the material of the current collecting member 15 corresponding to the second pole tab 133 is copper.
  • the thickness direction of the current collecting member 15 extends along the first direction P.
  • the size and shape of the current collecting member 15 may match the size and shape of the electrode assembly 13 , or may not match the size and shape of the electrode assembly 13 .
  • the first tab 132 and the second tab 133 are respectively located on both sides of the main body 131; in other embodiments of the present application , along the first direction P, the first tab 132 and the second tab 133 may also be disposed on the same side.
  • first electric energy output part 14 and the second electric energy output part are respectively arranged on opposite sides of the cylindrical battery cell 10 , and the first tab 132 is connected to the first electric energy output part 132 .
  • the part 14 is electrically connected, and the second tab 133 is electrically connected to the second power output part.
  • Both the first power output part 14 and the second power output part may be electrode terminals, or one of them may be an electrode terminal.
  • the first electric energy output part 14 is an electrode terminal and is disposed on the first end cover 123, and the second electric energy output The first electric energy output part 14 is an electrode terminal and is disposed on the end cover 12 , and the second electric energy output part is The bottom wall 113 of the housing 11 .
  • both the first tab 132 and the second tab 133 are electrically connected to the electric energy output part of the same polarity through the corresponding current collecting member 15 .
  • the cylindrical battery cell 10 may not be provided with the current collecting member 15 , the first tab 132 is directly connected to the first electric energy output part 14 , and the second tab 133 is directly connected to the second electric energy output part.
  • FIG. 6 shows a partial enlarged view of position A in FIG. 5 (the electrode assembly is not shown).
  • a cylindrical battery cell 10 including a housing 11 and an end cover 12.
  • the end of the housing 11 along the first direction P has an opening.
  • the end cap covers the opening.
  • the housing 11 includes a side wall 111.
  • the side wall 111 includes a first wall portion 114 and a second wall portion 115 arranged along the first direction P.
  • the second wall portion 115 is located on a side of the first wall portion 114 close to the opening.
  • the thickness H2 of the second wall part 115 is greater than the thickness H1 of the first wall part 114, and the second wall part 115 is welded to the end cap.
  • openings may be formed at two opposite ends of the housing 11 along the first direction P.
  • the two openings are the first opening 1121 and the second opening 1122, and the two end caps are the first end cap 123 and the second end cap 124 respectively.
  • the first end cap 123 covers the first opening 1121.
  • the second end cap 124 covers the second opening 1122 and is welded to the corresponding second wall 115 .
  • the housing 11 may have an opening 112 at only one end, one end cap 12 covering the opening 112 , one second wall portion 115 , and one second wall portion 115 .
  • the second wall portion 115 is disposed on the side of the first wall portion 114 close to the opening 112, and the end cover 12 is welded to the second wall portion 115.
  • the following uses the cylindrical battery cell shown in Figure 5 as an example. The structure related to the second wall portion 115 will be described in detail.
  • the thickness of the second wall portion 115 is H2, and the thickness of the first wall portion 114 is H1, H2>H1.
  • the thickness of the connection between the first wall portion 114 and the second wall portion 115 can be changed gently, or can be changed directly by forming a step.
  • FIG. 7 shows a schematic structural view of the casing of the cylindrical battery cell shown in FIG. 5 .
  • the radial direction of the housing 11 extends along the second direction R, and the circumferential direction extends along the third direction Q.
  • the thickness of the second wall portion 115 may be increased by the way that its inner surface protrudes toward the inside of the housing 11 and/or its outer surface protrudes toward the outside of the housing 11; along In the third direction Q, the second wall portion 115 can be arranged in a full circle around the housing 11; the second wall portion 115 can also be arranged in a half circle or more than half a circle around the housing 11; along the third direction Q, the second wall portion 115 can be arranged in a full circle around the housing 11.
  • the lengths L in the first direction P may be the same or different.
  • the second wall portion 115 when the second wall portion 115 is welded to the end cap 12, since H2>H1, the surface of the second wall portion 115 facing the end cap 12 is directly opposite the area of the end cap 12 Larger, the casing 11 and the end cover 12 have a larger welding area, which improves the welding quality of the casing 11 and the end cover 12 and improves the assembly qualification rate and safety performance of the cylindrical battery cell 10 .
  • the second wall 115 has a first surface 1151 , the first surface 1151 is welded to the end cover 12 , and the first surface 1151 serves as the base for the housing 11 in the first direction P. on an end face.
  • the surface of the second wall portion 115 facing the end cap 12 along the first direction P is the first surface 1151 , and the first surface 1151 is substantially parallel to the end cap 12 .
  • the outline projection of the outer edge of the end cap 12 may completely fall into the first surface 1151 , may partially fall into the first surface 1151 , or may not fall into the first surface 1151 .
  • the area where the first surface 1151 and the end cap 12 are arranged opposite to each other refers to the area where the projections of the first surface 1151 and the end cap 12 in the first direction P coincide with each other.
  • the area of the first surface 1151 facing the end cover 12 is relatively large, so that there is enough area for welding connection with the end cover 12, which improves the welding quality of the housing 11 and the end cover 12.
  • the end cap 12 includes a body part 121 and an edge part 122.
  • the edge part 122 is arranged around the body part 121.
  • the thickness H4 of the edge part 122 is smaller than the thickness H3 of the body part 121.
  • the edge portion 122 is welded to the first surface 1151 , and along the first direction P, the projection of the outer edge of the edge portion 122 falls into the first surface 1151 .
  • the body part 121 is used for installing the first power output part 14 and arranging liquid injection holes, etc.
  • the edge part 122 is used for welding connection with the housing 11 .
  • the edge portion 122 has a second surface 1221 facing the first surface 1151 along the first direction P. Along the first direction P, the gap between the first surface 1151 and the second surface 1221 is the welding area 116, and the laser is injected into the gap to weld the first surface 1151 and the second surface 1221 through flux.
  • the outer edge of the edge portion 122 refers to the outer contour of the second surface 1221 along the third direction Q, hereinafter referred to as the outer edge of the second surface 1221; the inner edge of the edge portion 122 refers to the outer contour of the second surface 1221 along the third direction Q.
  • the inner contour in the third direction Q is hereinafter referred to as the inner edge of the second surface 1221 .
  • the projection of the outer edge of the edge portion 122 falling into the first surface 1151 means that the projection of the outer edge of the second surface 1221 falls into the first surface 1151 . That is to say, the outer edge of the second surface 1221 falls into the first surface 1151, and the inner edge of the second surface 1221 may fall into the first surface 1151, or may be located inside the inner edge of the first surface 1151.
  • the projection of the second surface 1221 may entirely fall into the first surface 1151 or partially fall into the first surface 1151 .
  • the projections of the outer edge and the inner edge of the second surface 1221 both fall into the first surface 1151
  • the outer peripheral surface of the body part 121 is a cone
  • the outer peripheral surface of the body part 121 is in contact with the opening 112
  • the inner edges of the first surface 1151 and the second surface 1221 have a gap in the first direction P; in other embodiments of the present application, due to manufacturing tolerances, the first surface 1151 and the second surface 1151 have a gap.
  • the flatness of 1221 is poor.
  • first surface 1151 and the second surface 1221 When the first surface 1151 and the second surface 1221 are in contact, there may be a local gap between the first surface 1151 and the second surface 1221. Only the outer edge of the second surface 1221 falls into the first surface. 1151. The projection of the inner edge of the second surface 1221 may also be located outside the first surface 1151.
  • the body portion 121 protrudes from the surface of the end cover 12 facing the housing 11 along the first direction P, the surface of the end cover 12 facing away from the housing 11 is flush, and the outer periphery of the body portion 121 The side abuts against the inner edge of the opening 112 , so that the end cap 12 covers the opening 112 while achieving a gap between the first surface 1151 and the second surface 1221 .
  • the body part 121 may also protrude from the surface of the end cover 12 away from the housing 11 , or the body part 121 may have a recess in the side facing the housing 11 to increase the height of the cylindrical battery cell 10 energy density.
  • the projection of the outer edge of the edge portion 122 falls into the first surface 1151, that is, the surface of the edge portion 122 facing the first surface 1151 is at least partially opposite to the first surface 1151,
  • the first surface 1151 and the edge portion 122 are reliably welded together, thereby improving the welding quality of the housing 11 and the end cover 12 .
  • the area of the second surface 1221 can also be increased by increasing the length of the edge portion 122 in the second direction R, thereby increasing the area of the second surface 1221 facing the first surface 1151 and improving the edge portion. 122 and the second wall portion 115 of the welding quality.
  • the second wall portion 115 protrudes from the inner surface of the first wall portion 114 .
  • the surface of the first wall portion 114 facing the inside of the housing 11 is the first inner surface 1141 , and the surface facing the outside of the housing 11 is the first outer surface. 1142.
  • the surface of the second wall portion 115 facing the inside of the housing 11 is the second inner surface 1152, and the surface facing the outside of the housing 11 is the second outer surface 1153.
  • the second inner surface 1152 protrudes from the first inner surface 1141 , that is, the inner diameter of the second wall portion 115 is smaller than the inner diameter of the first wall portion 114 .
  • the first outer surface 1142 and the second outer surface 1153 may be flush or uneven.
  • the second inner surface 1152 may protrude from the first inner surface 1141 everywhere in the third direction Q, or may protrude from the first inner surface 1141 partially.
  • the second inner surface 1152 protrudes from the first inner surface 1141, which can not only increase the thickness of the second wall portion 115, but also reduce the protrusion of the second outer surface 1153 of the second wall portion 115 under the same thickness.
  • the degree of the first outer surface 1142 reduces the increase in the outer volume of the cylindrical battery cell 10 due to the increase in the thickness of the second wall portion 115 and improves the energy density of the cylindrical battery cell 10 .
  • the outer surface of the first wall portion 114 is flush with the outer surface of the second wall portion 115 .
  • the first outer surface 1142 is flush with the second outer surface 1153 , that is, the outer diameter of the first wall portion 114 is the same as the outer diameter of the second wall portion 115 .
  • the thickness of the second wall portion 115 is greater than the thickness of the first wall portion 114 without increasing the outer surface of the cylindrical battery cell 10. volume, thereby increasing the energy density of the cylindrical battery cell 10 .
  • FIG. 8 shows a partial structural diagram of the casing of a third form of cylindrical battery cell according to some embodiments of the present application.
  • the second wall portion 115 protrudes from the outer surface of the first wall portion 114 .
  • the second outer surface 1153 protrudes from the first outer surface 1142 , that is, the outer diameter of the second wall portion 115 is greater than the outer diameter of the first wall portion 114 .
  • the first inner surface 1141 and the second inner surface 1152 may be flush or uneven.
  • the second outer surface 1153 protrudes from the first outer surface 1142, which can not only increase the thickness of the second wall portion 115, but also reduce the protrusion of the second wall portion 115 from the first wall portion 114 at the same thickness.
  • the extent of the inner surface of the second wall portion 115 reduces the narrowing of the opening 112 of the cylindrical battery cell 10 due to the increase in the thickness of the second wall portion 115, making it easier for the electrode assembly 13 to be placed inside the case 11, which is beneficial to the cylindrical battery cell. 10 assembly process.
  • the inner surface of the first wall portion 114 is flush with the inner surface of the second wall portion 115 .
  • the first inner surface 1141 is flush with the second inner surface 1152 , that is, the inner diameter of the first wall portion 114 is the same as the inner diameter of the second wall portion 115 .
  • the thickness of the second wall portion 115 is greater than the thickness of the first wall portion 114 while maintaining the original opening 112 of the cylindrical battery cell 10.
  • the large external volume makes it easy to put the electrode assembly 13 into the interior of the casing 11 , which facilitates the assembly process of the cylindrical battery cell 10 .
  • Figure 9 shows a partial structural diagram of a fourth form of cylindrical battery cell according to some embodiments of the present application.
  • the second wall portion 115 includes a base portion 1154 and a transition portion 1155 , and the transition portion 1155 is connected between the base portion 1154 and the first wall portion 114 along a line away from the base portion. In the direction of 1154, the thickness of the transition portion 1155 gradually decreases.
  • H5 changes from H2 to H1.
  • the aforementioned thickness H2 of the second wall portion 115 refers to the thickness of the base portion 1154
  • the second inner surface 1152 and the second outer surface 1153 also refer to the surfaces of the base portion 1154 facing the inside of the housing 11 and The surface facing the outside of the housing 11 .
  • the surface of the transition portion 1155 facing the inside of the housing 11 is the third inner surface 11551, and the surface facing the outside of the housing 11 is the third outer surface 11552.
  • the thickness variation of the transition portion 1155 along the first direction P may be achieved by the third inner surface 11551 being inclined relative to the second inner surface 1152 and/or the third outer surface 11552 being inclined relative to the second outer surface 1153 .
  • the thickness of the transition portion 1155 gradually decreases from the base portion 1154 toward the first wall portion 114 to achieve a gentle transition in thickness from the base portion 1154 of the housing 11 to the first wall portion 114 , not only making the The outer surface and/or the inner surface of the housing 11 extends smoothly, which reduces the possibility of the housing 11 scratching the electrode assembly 13 or the staff, and can also avoid the connection between the base part 1154 and the first wall part 114 due to the sudden decrease in thickness.
  • the structural strength is reduced, so that the structural strength of the casing 11 is generally uniform, and the safety performance of the cylindrical battery cell 10 is improved.
  • the outer surface of the base portion 1154 is flush with the outer surface of the transition portion 1155 , and the inner surface of the transition portion 1155 is inclined relative to the inner surface of the base portion 1154 .
  • the second outer surface 1153 is flush with the third outer surface 11552, and the third inner surface 11551 is inclined relative to the second inner surface 1152. That is, the outer diameter of the transition portion 1155 is the same as the outer diameter of the base portion 1154. The inner diameter of the portion 1155 is larger than the inner diameter of the base portion 1154 .
  • the third inner surface 11551 is inclined relative to the second inner surface 1152. This means that the second inner surface 1152 protrudes from the first inner surface 1141.
  • one end of the third inner surface 11551 is in contact with the second inner surface 11551.
  • the surface 1152 is connected, and the other end extends in a direction pointing toward the outside of the housing 11 along the second direction R until it is connected with the first inner surface 1141, that is, along the direction from the first end 11553 to the second end 11554, the transition portion 1155
  • the inner diameter gradually increases.
  • the outer surface of the base part 1154 and the outer surface of the transition part 1155 are flush, which does not increase the outer volume of the cylindrical battery cell 10 and can improve the energy density of the cylindrical battery cell 10; the inner surface of the transition part 1155 The surface is inclined relative to the inner surface of the base portion 1154 so that the inner surface of the casing 11 extends smoothly, reducing the possibility of the casing 11 scratching the electrode assembly 13 and improving the safety performance of the cylindrical battery cell 10 .
  • the second wall portion 115 extends in a circle along the circumferential direction of the housing 11 (ie, the third direction Q).
  • the second wall portion 115 is a closed annular shape surrounding the axial direction of the housing 11 (ie, the first direction P).
  • the thickness of the second wall portion 115 may be the same or different.
  • the surface of the second wall portion 115 facing the end cover 12 can be made smaller than the thickness of the second wall portion 115 in the circumferential direction of the housing 11 .
  • the area directly facing the end cover 12 is larger, so that the welding quality of the housing 11 and the end cover 12 in the circumferential direction of the housing 11 is better.
  • the thickness of the first wall portion 114 is H1
  • the thickness of the second wall portion 115 is H2, satisfying 0.01mm ⁇ H2-H1 ⁇ 1mm.
  • the thickness H2 of the second wall portion 115 is 0.01-1 mm thicker than the thickness H1 of the first wall portion 114 .
  • the thickness of the base portion 1154 is taken as the thickness of the second wall portion 115 .
  • the minimum value of H2-H1 is 0.1mm, and the maximum value is 1mm.
  • the value of H2-H1 can be 0.1mm, 0.2mm, 0.4mm, 0.6mm, 0.8mm, 0.9mm, etc.
  • the thickness of the second wall portion 115 and the thickness of the first wall portion 114 can have multiple sets of values.
  • the relationship between the thickness H1 of the first wall part 114 and the thickness H2 of the second wall part 115 satisfies the above range, which can increase the thickness of the second wall part 115 relative to the first wall part 114, so that the thickness of the second wall part 115 can be increased.
  • the second wall portion 115 is reliably welded to the end cover 12, and the variation range of the thickness of the connection between the first wall portion 114 and the second wall portion 115 can be smaller, so that the structural strength of the housing 11 is relatively uniform.
  • the length of the second wall portion 115 is L, satisfying 1 mm ⁇ L ⁇ 10 mm.
  • the length of the base portion 1154 is taken as the length of the second wall portion 115 .
  • L 1mm, 3mm, 5mm, 6mm, 7mm, 9mm, 10mm, etc.
  • the length L of the second wall part 115 along the first direction P satisfies the above range, that is, it has a sufficient length in the first direction P and reduces the heat and softening of the second wall part 115 and the end cap 12 during the welding process.
  • the possibility of deformation can also reduce the length ratio of the second wall portion 115 to the first wall portion 114 in the first direction P, making the total weight of the case 11 thinner and meeting the lightweight requirement of the cylindrical battery cell 10 .
  • Figure 10 shows a schematic diagram showing the relationship between the inner diameter of the second wall portion and the outer diameter of the electrode assembly in a cylindrical battery cell according to some embodiments of the present application.
  • the cylindrical battery cell 10 also includes an electrode assembly 13, which is accommodated inside the housing 11, and the winding axis of the electrode assembly 13 extends along the first direction P.
  • the inner diameter of the second wall portion 115 is D1
  • the outer diameter of the electrode assembly 13 is D2, satisfying D1-D2 ⁇ 0.1mm.
  • the inner diameter of the base portion 1154 is taken as the inner diameter of the second wall portion 115 (as shown in FIG. 9 ).
  • the outer diameter D2 of the electrode assembly 13 refers to the outer diameter value of the electrode assembly 13 in the de-charged state, that is, the outer diameter value when it is not charged and expanded.
  • the values of D1-D2 can be 0.1mm, 0.3mm, 0.5mm, 0.7mm, 0.9mm, 1.2mm, 1.5mm, 2.5mm, 4mm, 6mm, etc.
  • 0.1mm ⁇ D1-D2 ⁇ 4mm not only facilitates the smooth placement of the electrode assembly 13 into the interior of the housing 11 from the opening 112, but also enables the gap between the electrode assembly 13 and the inner surface of the side wall 111 to be The smaller gap reduces the shaking amplitude of the electrode assembly 13 in the second direction R, making the internal structure of the cylindrical battery cell 10 compact and with higher energy density. It should be mentioned that on a plane perpendicular to the first direction P, the projection of the current collecting member 15 should fall into the projection of the electrode assembly 13 to ensure the safety performance of the cylindrical battery cell 10 .
  • the relationship between the inner diameter D1 of the second wall portion 115 and the outer diameter D2 of the electrode assembly 13 satisfies the above range, which is conducive to the smooth placement of the electrode assembly 13 into the interior of the case 11 from the opening 112 and is conducive to the cylindrical battery cell 10 assembly process.
  • openings are formed at two opposite ends of the housing 11 along the first direction P, two second wall portions 115 are provided, and the two second wall portions 115 are located on both sides of the first wall portion 114 On the side, two end caps are provided, and the end caps correspond to the openings one by one.
  • the two openings are a first opening 1121 and a second opening 1122.
  • the first opening 1121 and the second opening 1122 are respectively provided on the side wall 111 facing each other along the first direction P.
  • the two end caps are the first end cap 123 and the second end cap 124 respectively.
  • the first end cap 123 covers the first opening 1121 and is welded to the second wall 115 on the same side.
  • the second end cap 124 Covers the second opening 1122 and is welded to the second wall 115 on the same side.
  • connection method between the first end cap 123 and the second wall part 115 on the same side and the connection method between the second end cap 124 and the second wall part 115 on the same side are the same as the implementation of the aforementioned end caps.
  • the connection method between the end cover 12 and the second wall portion 115 is the same and will not be described further here.
  • the two ends of the housing 11 along the first direction P are welded to the first end cover 123 and the second end cover 124 respectively.
  • the two ends of the housing 11 along the first direction P are respectively provided with a first end cover 123 and a second end cover 124 .
  • the second wall portion 115 is used to improve the welding quality of the first end cover 123 and the second end cover 124 with the housing 11 .
  • Some embodiments of the present application provide a battery 100 including the cylindrical battery cell 10 of the embodiment of the present application.
  • the battery 100 in the embodiment of the present application also has better safety performance.
  • Some embodiments of the present application provide an electrical device, including the battery 100 of the embodiment of the present application, and the battery 100 is used to provide electric energy.
  • the electrical device in the embodiment of the present application also has better safety performance.
  • Figure 11 shows a schematic diagram of the connection between the end cap and the casing showing poor roundness in the cylindrical battery cell of some embodiments of the present application
  • Figure 12 shows the connection between the end cap and the casing showing poor roundness in the prior art.
  • a cylindrical battery cell 10 including a case 11 , an end cover 12 and an electrode assembly 13 .
  • the case 11 includes side walls 111 and a bottom wall 113 .
  • one side of the side wall 111 has an opening 112 and the other side is closed by a bottom wall 113 .
  • the side wall 111 has a first wall portion 114 and a second wall portion 115 along the first direction P.
  • the second wall portion 115 is provided close to the opening 112.
  • Cover 12 is welded and connected.
  • the end cap 12 includes a body portion 121 and an edge portion 122 extending circumferentially around the body portion 121 .
  • a side of the second wall portion 115 facing the end cap 12 has a first surface 1151
  • a side of the edge portion 122 facing the second wall portion 115 has a first surface 1151 .
  • One side of the wall portion 115 has a second surface 1221, and the first surface 1151 and the second surface 1221 are substantially parallel along the first direction P with a gap therebetween.
  • the thickness H2 of the second wall portion 115 is greater than the thickness H1 of the first wall portion 114 so that the second surface 1221 and the first surface 1151 have a larger facing area in the first direction P. That is to say, when the roundness of the end cover 12 and the opening 112 of the housing 11 is poor, the first surface 1151 and the second surface 1221 have overlapping portions in the first direction P, and the end cover 12 can completely cover the opening 112 , the space inside the casing 11 will not be exposed in the first direction P, and during the welding and connection process of the casing 11 and the end cover 12 , it can effectively prevent the laser from entering the interior of the casing 11 and burning the electrode assembly 13 .
  • the thickness of the opening 112 of the housing 11 is still H1.
  • the end cover 12 cannot completely cover the opening 112 of the housing 11.
  • the end cover 12 There is a first gap 1156 between the edge and the opening 112, exposing the space inside the housing 11.
  • one side of the housing 11 has an opening 112
  • the end cover 12 has an opening 112
  • a second wall portion 115 is provided
  • a second wall portion 115 is connected with the end cover 12 Welding connection;
  • both sides of the housing 11 have a first opening 1121 and a second opening 1122 respectively, and there are two end caps, namely the first end cap 123
  • There are two second wall portions 115 corresponding to the second end cap 124 there are two second wall portions 115 corresponding to the second end cap 124 , and the two second wall portions 115 are respectively disposed on both sides of the first wall portion 114 .
  • the second wall portion 115 can be thicker than the first wall portion 114 by protruding inwardly and/or outwardly. thickness of.
  • the second wall portion 115 includes a base portion 1154 and a transition portion 1155 disposed along the first direction P, and the base portion 1154 and the first wall portion 114 are connected through the transition portion 1155 , the base part 1154 is welded to the end cover 12, and the transition part 1155 realizes a gentle transition of the thickness changes of the base part 1154 and the first wall part 114, so as to make the inner surface and/or the outer surface of the shell 11 smoothly transition, and the shell
  • the structural strength of 11 is relatively uniform.
  • the dimensional parameters of the second wall portion 115 refer to the dimensional parameters of the base portion 1154 .
  • the welding step can be effectively reduced, the welding efficiency can be improved, the weld strength can be enhanced, and the cylindrical battery cell can be improved.
  • the safety performance of the cylindrical battery cell 10 is improved by eliminating problems such as laser leakage, partial welding, broken welding, and burst spots due to roundness problems in the welding of the body 10 .

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  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
  • Battery Mounting, Suspending (AREA)

Abstract

本申请涉及一种圆柱电池单体、电池以及用电装置，属于电池制造技术领域。本申请提出一种圆柱电池单体，包括：壳体，所述壳体的沿第一方向的端部具有开口；端盖，覆盖于所述开口；其中，所述壳体包括侧壁，所述侧壁包括沿所述第一方向设置的第一壁部和第二壁部，所述第二壁部位于所述第一壁部的靠近所述开口的一侧，所述第二壁部的厚度大于所述第一壁部的厚度，所述第二壁部与所述端盖焊接连接。该圆柱电池单体的壳体和端盖焊接质量良好，从而具有较高的安全性能。本申请还提出一种电池以及用电装置，包括该圆柱电池单体。

Description

圆柱电池单体、电池以及用电装置 技术领域
本申请涉及电池制造技术领域，具体而言，涉及一种圆柱电池单体、电池以及用电装置。
背景技术
随着新能源汽车市场的持续繁荣，动力电池行业迅速扩产壮大，锂电池技术日益精进，对电池单体的安全性能提出了越来越高的要求。
目前，对于圆柱电池单体而言，圆柱电池单体的壳体和端盖的焊接质量较差，不仅组装合格率较差，且组装成型后的圆柱电池单体存在一定的安全隐患。
发明内容
为此，本申请提出一种圆柱电池单体、电池以及用电装置，圆柱电池单体的壳体和端盖焊接质量良好，从而具有较高的安全性能。
本申请第一方面实施例提出一种圆柱电池单体，包括：壳体，所述壳体的沿第一方向的端部具有开口；端盖，覆盖于所述开口；其中，所述壳体包括侧壁，所述侧壁包括沿所述第一方向设置的第一壁部和第二壁部，所述第二壁部位于所述第一壁部的靠近所述开口的一侧，所述第二壁部的厚度大于所述第一壁部的厚度，所述第二壁部与所述端盖焊接连接。
本申请实施例的圆柱电池单体中，第二壁部与端盖焊接连接时，由于第二壁部的厚度大于第一壁部的厚度，使第二壁部的面向端盖的表面正对端盖的面积较大，从而壳体有足够的面积与端盖焊接连接，提高了壳体与端盖的焊接质量，提高了圆柱电池单体的组装合格率以及安全性能。
根据本申请的一些实施例，所述第二壁部具有第一表面，所述第一表面与所述端盖焊接连接，所述第一表面为所述壳体在所述第一方向上的一个端面。
在上述方案中，第一表面正对端盖的面积较大，从而有足够的面积与端盖焊接连接，提高了壳体与端盖的焊接质量。
根据本申请的一些实施例，所述端盖包括本体部和边缘部，所述边缘部围绕所述本体部设置，所述边缘部的厚度小于所述本体部的厚度，所述边缘部与所述第一表面焊接连接，沿着所述第一方向，所述边缘部的外边缘的投影落入所述第一表面。
在上述方案中，沿着第一方向，边缘部的外边缘的投影落入第一表面，即边缘部的面向第一表面的表面与第一表面至少部分正对设置，实现第一表面与边缘部可靠焊接连接，提高了壳体与端盖的焊接质量。
根据本申请的一些实施例，所述第二壁部凸出于所述第一壁部的内表面。
在上述方案中，第二壁部凸出于第一壁部的内表面，不仅能够增加第二壁部的厚度，且能够减少第二壁部在同等厚度下凸出于第一壁部的外表面的程度，减小由于第二壁部的厚度增加所导致圆柱电池单体的外体积增大的程度，提高圆柱电池单体的能量密度。
根据本申请的一些实施例，所述第一壁部的外表面与所述第二壁部的外表面平齐。
在上述方案中，由于第一壁部的外表面与第二壁部的外表面平齐，在实现第二壁部的厚度大于第一壁部的厚度的同时不会增大圆柱电池单体的外体积，从而提高圆柱电池单体的能量密度。
根据本申请的一些实施例，所述第二壁部凸出于所述第一壁部的外表面。
在上述方案中，第二壁部凸出于第一壁部的外表面，不仅能够增加第二壁部的厚度，且能够减少第二壁部在同等厚度下凸出于第一壁部的内表面的程度，减小由于第二壁部的厚度增加所导致圆柱电池单体的开口变窄的程度，使电极组件易于放入壳体的内部，利于圆柱电池单体的组装过程。
根据本申请的一些实施例，所述第一壁部的内表面与所述第二壁部的内表面平齐。
在上述方案中，由于第一壁部的内表面与第二壁部的内表面平齐，在实现第二壁部的厚度大于第一壁部的厚度的同时维持圆柱电池单体原有的开口大小的外体积，使电极组件易于放入壳体的内部，利于圆柱电池单体的组装过程。
根据本申请的一些实施例，所述第二壁部包括基体部和过渡部，所述过渡部连接于所述基体部和所述第一壁部之间，沿背离所述基体部的方向，所述过渡部的厚度逐渐减小。
在上述方案中，从基体部朝向第一壁部的方向，过渡部的厚度逐渐减小，以实现壳体的基体部到第一壁部的厚度的缓和过渡，不仅使壳体的外表面和/或内表面圆滑延伸，降低壳体刮伤电极组件或者工作人员的可能性，还能够避免基体部和第一壁部的连接处由于厚度骤减而导致结构强度降低，从而使壳体的结构强度大致均匀，提高了圆柱电池单体的安全性能。
根据本申请的一些实施例，所述基体部的外表面和所述过渡部的外表面平齐，所述过渡部的内表面相对于所述基体部的内表面倾斜设置。
在上述方案中，基体部的外表面和过渡部的外表面平齐，不会增大圆柱电池单体的外体积，能够提高圆柱电池单体的能量密度；过渡部的内表面相对于基体部的内表面倾斜设置，使壳体的内表面圆滑延伸，降低壳体刮伤电极组件的可能性，提高圆柱电池单体的安全性能。
根据本申请的一些实施例，所述第二壁部沿所述壳体的周向延伸一圈。
在上述方案中，由于在壳体的周向上第二壁部的厚度均大于第二壁部的厚度，能够使第二壁部的面向端盖的表面在壳体的周向上正对端盖的面积均较大，实现壳体与端盖在壳体的周向上的焊接质量均较好。
根据本申请的一些实施例，所述第一壁部的厚度为H1，所述第二壁部的厚度为H2，满足0.01mm≤H2-H1≤1mm。
在上述方案中，第一壁部的厚度H1与第二壁部的厚度H2之间的关系满足上述范围，既能够增加第二壁部相对于第一壁部的厚度，使第二壁部与端盖可靠地焊接连接，又能够使第一壁部与第二壁部的连接处的厚度的变化范围较小，使壳体的结构强度比较均匀。
根据本申请的一些实施例，沿着所述第一方向，所述第二壁部的长度为L，满足1mm≤L≤10mm。
在上述方案中，第二壁部沿着第一方向的长度L满足上述范围，既在第一方向上具有足够的长度，降低第二壁部与端盖焊接过程发热而软化形变的可能性，还能够降低在第一方向上第二壁部与第一壁部的长度比，使壳体的总重量较薄，满足圆柱电池单体的轻量化要求。
根据本申请的一些实施例，所述圆柱电池单体还包括：电极组件，容纳于所述壳体的内部，所述电极组件的卷绕轴线沿所述第一方向延伸，所述第二壁部的内径为D1，所述电极组件的外径为D2，满足D1-D2≥0.1mm。
在上述方案中，第二壁部的内径D1与电极组件的外径D2的关系满足上述范围，利于电极组件从开口顺利地放入壳体的内部，利于圆柱电池单体的组装过程。
根据本申请的一些实施例，所述开口形成于所述壳体沿所述第一方向相对的两端，所述第二壁部设置有两个，两个所述第二壁部位于所述第一壁部的两侧，所述端盖设置有两个，所述端盖与所述开口一一对应。
在上述方案中，壳体沿着第一方向的两端分别与一个端盖焊接连接，壳体沿着第一方向的两端分别设有第二壁部，以提高每个端盖与壳体的焊接质量。
本申请第二方面实施例提出一种电池，包括本申请第一方面实施例所述的圆柱电池单体。
由于本申请第一方面实施例的圆柱电池单体的特性，本申请第二方面实施例的电池也具有较好的安全性能。
本申请第三方面实施例提出一种用电装置，包括本申请第二方面实施例所述的电池，所述电池用于提供电能。
由于本申请第二方面实施例的电池的特性，本申请第三方面实施例的用电装置也具有较好的安全性能。
本申请的附加方面和优点将在下面的描述中部分给出，部分将从下面的描述中变得明显，或通过本申请的实践了解到。
附图说明
为了更清楚地说明本申请实施例的技术方案，下面将对实施例中所需要使用的附图作简单地介绍，应当理解，以下附图仅示出了本申请的某些实施例，因此不应被看作是对范围的限定，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他相关的附图。
图1示出的是本申请一实施例中的一种车辆的简易示意图；
图2示出的是图1中车辆的电池的结构示意图；
图3示出的是本申请的一些实施例的第一种形式的圆柱电池单体的结构示意图；
图4示出的是图3示出的圆柱电池单体的内部结构图(未示意出电能输出部和集流构件)；
图5示出的是本申请的一些实施例的第二种形式的圆柱电池单体的内部结构图(未示意出电能输出部和集流构件)；
图6示出的是图5中A处的局部放大图(未示意出电极组件)；
图7示出的是图5示出的圆柱电池单体的壳体的结构示意图；
图8示出的本申请的一些实施例的第三种形式的圆柱电池单体的壳体的局部结构示意图；
图9示出的是本申请的一些实施例的第四种形式的圆柱电池单体的局部结构示意图；
图10示出的是本申请的一些实施例的圆柱电池单体中体现第二壁部的内径与电极组件的外径关系的示意图；
图11示出的是本申请的一些实施例的圆柱电池单体中体现圆度不良的端盖与壳体连接的示意图；
图12示出的是现有技术中体现圆度不良的端盖与壳体连接的示意图；
上述附图未按比例提供。
图标：1000-车辆；100-电池；10-圆柱电池单体；11-壳体；111-侧壁；112-开口；1121-第一开口；1122-第二开口；113-底壁；114-第一壁部；1141-第一内表面；1142-第一外表面；115-第二壁部；1151-第一表面；1152-第二内表面；1153-第二外表面；1154-基体部；1155-过渡部；11551-第三内表面；11552-第三外表面；1156-第一缝隙；116-焊接区域；12-端盖；121-本体部；122-边缘部；1221-第二表面；123-第一端盖；124-第二端盖；13-电极组件；131-主体；132-第一极耳；133-第二极耳；14-第一电能输出部；15-集流构件；20-箱体；21-第一子箱体；22-第二子箱体；200-控制器；300-马达；P-第一方向；R-第二方向；Q-第三方向。
具体实施方式
为使本申请实施例的目的、技术方案和优点更加清楚，下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚地描述，显然，所描述的实施例是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
除非另有定义，本申请所使用的所有的技术和科学术语与属于本申请的技术领域的技术人员通常理解的含义相同；本申请中在申请的说明书中所使用的术语只是为了描述具体的实施例的目的，不是旨在于限制本申请；本申请的说明书和权利要求书及上述附图说明中的术语“包括”和“具有”以及他们的任何变形，意图在于覆盖不排他的包含。本申请的说明书和权利要求书或上述附图中的术语“第一”、“第二”等是用于区别不同对象，而不是用于描述特定顺序或主次关系。
在本申请中提及“实施例”意味着结合实施例描述的特定特征、结构或特性可以包含在本申请的至少一个实施例中。在说明书中的各个位置出现该短语并不一定均是指相同的实施例，也不是与其它实施例互斥的独立的或备选的实施例。本领域技术人员显式地和隐式地理解的是，本申请所描述的实施例可以与其它实施例相结合。
在本申请的描述中需要说明的是除非另有明确的规定和限定术语“安装”、“相连”、“连接”、“附接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本申请中的具体含义。
本申请中出现的“多个”指的是两个以上(包括两个)。
本申请中，电池单体可以包括锂离子二次电池、锂离子一次电池、锂硫电池、钠锂离子电池、钠离子电池或镁离子电池等，本申请实施例对此并不限定。
本申请的实施例所提到的电池是指包括一个或多个电池单体以提供更高的电压和容量的单一的物理模块。例如，本申请中所提到的电池可以包括电池模块或电池包等。电池一般包括用于封装一个或多个电池单体的箱体，箱体可以避免液体或其他异物影响电池单体的充电或放电。
电池单体包括电极组件和电解液，电极组件由正极极片、负极极片和隔膜组成。电池单体主要依靠金属离子在正极极片和负极极片之间移动来工作。正极极片包括正极集流体和正极活性物质层，正极活性物质层涂覆于正极集流体的表面，未涂敷正极活性物质层的正极集流体凸出于已涂覆正极活性物质层的正极集流体，未涂敷正极活性物质层的正极集流体作为正极极耳。以锂离子电池为例，正极集流体的材料可以为铝，正极活性物质可以为钴酸锂、磷酸铁锂、三元锂或锰酸锂等。负极极片包括负极集流体和负极活性物质层，负极活性物质层涂覆于负极集流体的表面，未涂敷负极活性物质层的负极集流体凸出于已涂覆负极活性物质层的负极集流体，未涂敷负极活性物质层的负极集流体作负极极耳。负极集流体的材料可以为铜，负极活性物质可以为碳或硅等。为了保证通过大电流而不发生熔断，正极极耳的数量为多个且层叠在一起，负极极耳的数量为多个且层叠在一起。隔膜的材质可以为PP(polypropylene，聚丙烯)或PE(polyethylene，聚乙烯)等。
电池单体还包括集流构件和电能输出部，集流构件用于将电池单体的极耳和同极性的电能输出部电连接，以将电能从电极组件输送至电能输出部，经电能输出部输送至电池单体的外部，电能输出部可以为电极端子，也可以为电池单体的端盖或者壳体的底壁；多个电池单体之间通过汇流部件实现电连接，以实现多个电池单体的串联、并联或者混联。
相关技术中，电池单体的组装过程中，壳体与端盖焊接连接，由于壳体以及端盖不可避免地存在制造公差，壳体的开口边缘与端盖的边缘的轮廓可能存在偏差，导致端盖不能完全覆盖开口，导致壳体与端盖的焊接质量较差。在激光沿着壳体的周向移动的过程中，激光很有可能会射入壳体的内部，灼伤壳体内部的电极组件，可能会损坏电极组件，降低电池单体的安全性能。尤其对于圆柱电池单体而言，由于壳体的开口的圆度以及端盖的圆度为较难控制的参数，圆柱电池单体的壳体与端盖焊接不良的概率很高，导致圆柱电池单体的组装合格率和安全性能显著较低。
发明人经研究发现，壳体与端盖的焊接过程中，壳体与端盖需要足够的正对面积，才能够实现二者之间焊接良好。目前，在圆柱电池单体的轴线方向上，端盖的边缘部和壳体的开口之间具有间隙，激光射入该间隙中，以实现端盖与壳体的焊接连接。如果能够增加壳体与端盖在圆柱电池单体的轴线方向上的正对面积或者优化开口处的圆度，将能够显著增加壳体与端盖的焊接质量，提高圆柱电池单体的组装合格率和安全性能。
基于上述思路，本申请提出一种新的技术方案，壳体包括沿其轴线方向设置的第一壁部和第二壁部，第二壁部位于第一壁部的靠近开口的一侧，第二壁部的厚度大于第一壁部的厚度，第二 壁部与端盖焊接连接。由于壳体的靠近开口的部分厚度增加，一方面能够增加第二壁部与端盖正对的面积，为装配和制造提供更大的误差范围，另一方面能够增加壳体开口处的强度，提高圆柱电池单体壳体开口处的圆度优率，在提高壳体与端盖的焊接质量，提高圆柱电池单体的安全性能的同时，不占用电池内部容纳电极组件的空间，对电池的能量密度几乎没有影响。
可以理解的是，本申请实施例描述的圆柱电池单体可以直接对用电装置供电，也可以通过并联或者串联的方式形成电池，以电池的形式对各种用电装置供电。
可以理解的是，本申请实施例中描述的使用圆柱电池单体、电池模块或者电池所适用的用电装置可以为多种形式，例如，手机、便携式设备、笔记本电脑、电瓶车、电动汽车、轮船、航天器、电动玩具和电动工具等等，例如，航天器包括飞机、火箭、航天飞机和宇宙飞船等等，电动玩具包括固定式或移动式的电动玩具，例如，游戏机、电动汽车玩具、电动轮船玩具和电动飞机玩具等等，电动工具包括金属切削电动工具、研磨电动工具、装配电动工具和铁道用电动工具，例如，电钻、电动砂轮机、电动扳手、电动螺丝刀、电锤、冲击电钻、混凝土振动器和电刨。
本申请的实施例描述的圆柱电池单体以及电池不仅仅局限适用于上述所描述的用电装置，还可以适用于所有使用圆柱电池单体以及电池的用电装置，但为描述简洁，下述实施例均以电动汽车为例进行说明。
图1示出的是本申请一实施例中的一种车辆的简易示意图；图2示出的是图1中车辆的电池的结构示意图。
如图1所示，车辆1000的内部设置有电池100、控制器200和马达300，例如，在车辆1000的底部或车头或车尾可以设置电池100。车辆1000可以为燃油汽车、燃气汽车或新能源汽车，新能源汽车可以是纯电动汽车、混合动力汽车或增程式汽车等。
在本申请的一些实施例中，电池100可以用于车辆1000的供电，例如，电池100可以作为车辆1000的操作电源。控制器200用来控制电池100为马达300的供电，例如，用于车辆1000的启动、导航和行驶时的工作用电需求。
在其他实施例中，电池100不仅仅可以作为车辆1000的操作电源，还可以作为车辆1000的驱动电源，替代或部分地替代燃油或天然气为车辆1000提供驱动动力。
其中，本申请的实施例所提到的电池100是指包括一个或多个圆柱电池单体10以提供更高的电压和容量的单一的物理模块。其中，多个圆柱电池单体10之间可以串联、并联或者混联直接组成电池100，混联指的是，多个圆柱电池单体10中既有串联又有并联。多个圆柱电池单体10也可以先串联、并联或者混联组成电池模块，多个电池模块再串联、并联或者混联组成电池100。
如图2所示，电池100包括多个圆柱电池单体10和箱体20，多个圆柱电池单体10放置于箱体20内。箱体20包括第一子箱体21和第二子箱体22，第一子箱体21和第二子箱体22相互盖合后形成电池腔，多个圆柱电池单体10放置于电池腔内。其中，第一子箱体21和第二子箱体22的形状可以根据多个圆柱电池单体10组合的形状而定，第一子箱体21和第二子箱体22可以均具有一个开口。例如，第一子箱体21和第二子箱体22均可以为中空长方体且各自只有一个面为开口面，第一子箱体21和第二子箱体22的开口相对设置，并且第一子箱体21和第二子箱体22相互扣合形成具有封闭腔室的箱体20。多个圆柱电池单体10相互并联或串联或混联组合后置于第一子箱体21和第二子箱体22扣合后形成的箱体20内。
图3示出的是本申请的一些实施例的第一种形式的圆柱电池单体的结构示意图；图4示出的是图3示出的圆柱电池单体的内部结构图(未示意出电能输出部和集流构件)；图5示出的是本申请的一些实施例的第二种形式的圆柱电池单体的内部结构图(未示意出电能输出部和集流构件)。
如图3、图4和图5所示，圆柱电池单体10包括壳体11、端盖、电极组件13、电能输出部和集流构件，电能输出部数量为两个，两个电能输出部分别为第一电能输出部14和第二电能输出部(图中没有示出)。
壳体11可以为圆柱形或者椭圆柱形，壳体11可由金属材料制成，诸如铝、铝合金或者镀 镍钢。端盖为板状结构，端盖的尺寸和形状与壳体11的开口匹配，端盖固定于壳体11的开口，从而将电极组件13和电解液封闭于壳体11的容纳腔。端盖采用金属材料制成，例如铝、钢等材料。
壳体11呈轴线方向沿第一方向P延伸的圆柱形，沿着第一方向P，壳体11的一端或者两端具有开口，端盖的数量与开口的数量对应设置，端盖覆盖于对应的开口，以将电极组件13封闭于壳体11的内部。
如图3和图4所示，在本申请的一些实施例中，沿着第一方向P，壳体11仅包括侧壁111，侧壁111的两端分别具有第一开口1121和第二开口1122，端盖数量为两个，两个端盖分别为第一端盖123和第二端盖124，第一端盖123覆盖第一开口1121，第二端盖124覆盖第二开口1122。
如图5所示，在本申请的另一些实施例中，壳体11包括侧壁111和底壁113，侧壁111围绕壳体11的轴线方向(即第一方向P)延伸，沿着第一方向P，侧壁111的一端具有开口112，另一端通过底壁113封闭，端盖数量为一个，端盖12覆盖开口112，且端盖12与开口112的形状匹配。
如图3和图4所示，电极组件13设置于壳体11内，电极组件13包括主体131、第一极耳132和第二极耳133。主体131包括正极极片、负极极片和隔膜，隔膜位于正极极片与负极极片之间，用于隔开正极极片与负极极片。其中，电极组件13采用卷绕方式成型，电极组件13具备卷绕中心孔，卷绕中心孔沿第一方向P贯穿电极组件13。第一极耳132和第二极耳133中，第一极耳132为正极极耳，第二极耳133为负极极耳。第一极耳132与一个集流构件15对应设置，第二极耳133与另一个集流构件15对应设置。其中，与第一极耳132对应的集流构件15的材料为铝，与第二极耳133对应的集流构件15的材料为铜。集流构件15的厚度方向沿第一方向P延伸，集流构件15的尺寸和形状可以与电极组件13匹配，也可以与电极组件13的尺寸和形状不匹配。
如图3所示，在本申请的一些实施例中，沿着第一方向P，第一极耳132和第二极耳133分别位于主体131的两侧；在本申请的另一些实施例中，沿着第一方向P，第一极耳132和第二极耳133也可以均设置于同一侧。
沿着第一方向P，第一电能输出部14和第二电能输出部(图中没有示出)分别布置于圆柱电池单体10的相对的两侧，第一极耳132与第一电能输出部14实现电连接，第二极耳133与第二电能输出部实现电连接。第一电能输出部14和第二电能输出部可以均为电极端子，也可以是其中一者为电极端子。基于前述的第一端盖123覆盖第一开口1121，第二端盖124覆盖第二开口1122的实施方式，第一电能输出部14为电极端子且设置于第一端盖123，第二电能输出部为第二端盖124；基于前述的端盖数量为一个，一个端盖12覆盖开口112的实施方式，第一电能输出部14为电极端子且设置于端盖12，第二电能输出部为壳体11的底壁113。
在本申请的一些实施例中，第一极耳132和第二极耳133均通过对应的集流构件15与同极性的电能输出部电连接。
在其他实施例中，圆柱电池单体10也可以不设置集流构件15，第一极耳132与第一电能输出部14直接连接，第二极耳133与第二电能输出部直接连接。
图6示出的是图5中A处的局部放大图(未示意出电极组件)。
如图4、图5和图6所示，本申请的一些实施例提出一种圆柱电池单体10，包括壳体11和端盖12，壳体11的沿第一方向P的端部具有开口，端盖覆盖于开口。其中，壳体11包括侧壁111，侧壁111包括沿第一方向P设置的第一壁部114和第二壁部115，第二壁部115位于第一壁部114的靠近开口的一侧，第二壁部115的厚度H2大于第一壁部114的厚度H1，第二壁部115与端盖焊接连接。
如图4所示，开口可以形成于壳体11沿着第一方向P相对的两端，端盖和第二壁部115的数量均为两个，两个第二壁部115分别位于第一壁部114的两侧，两个开口分别为第一开口1121和第二开口1122，两个端盖分别为第一端盖123和第二端盖124，第一端盖123覆盖第一开口1121且与对应的第二壁部115焊接连接，第二端盖124覆盖第二开口1122且与对应的第二壁部 115焊接连接。如图5所示，沿着第一方向P，壳体11可以仅有一端具有开口112，端盖数量为一个，该端盖12覆盖于开口112，第二壁部115数量为一个，一个第二壁部115设置于第一壁部114的靠近开口112的一侧，端盖12与第二壁部115焊接连接；为了便于描述，下面均以图5示出的圆柱电池单体为例来具体阐述第二壁部115相关的结构。
如图6所示，第二壁部115的厚度为H2，第一壁部114的厚度为H1，H2＞H1。第一壁部114与第二壁部115的连接处的厚度可以缓和变化，也可以通过形成台阶的形式直接变化。
图7示出的是图5示出的圆柱电池单体的壳体的结构示意图。
如图5、图6和图7所示，壳体11的径向沿第二方向R延伸，周向沿第三方向Q延伸。沿着第二方向R，第二壁部115可以通过其内表面向壳体11的内部凸出的方式和/或其外表面向壳体11的外部凸出的方式来实现其厚度增加；沿着第三方向Q，第二壁部115可以围绕壳体11设置一整圈；第二壁部115也可以围绕壳体11设置半圈或者大半圈；沿着第三方向Q，第二壁部115在第一方向P上的长度L可以相同，也可以不相同。
本申请实施例的圆柱电池单体10中，第二壁部115与端盖12焊接连接时，由于H2＞H1，使第二壁部115的面向端盖12的表面正对端盖12的面积较大，使得壳体11与端盖12具有较大的焊接面积，提高了壳体11与端盖12的焊接质量，提高了圆柱电池单体10的组装合格率以及安全性能。
如图6所示，在本申请的一些实施例中，第二壁部115具有第一表面1151，第一表面1151与端盖12焊接连接，第一表面1151为壳体11在第一方向P上的一个端面。
具体而言，第二壁部115的沿着第一方向P面向端盖12的表面为第一表面1151，第一表面1151与端盖12大致平行设置。沿着第一方向P，端盖12的外边缘的轮廓投影可以完全落入第一表面1151，可以部分落入第一表面1151，也可以不落入第一表面1151。
第一表面1151与端盖12正对设置的面积指的是，第一表面1151与端盖12在第一方向P上的投影彼此重合的面积。通过增加第二壁部115相对于第一壁部114的厚度，能够增加第一表面1151的面积，从而增加第一表面1151与端盖12正对设置的面积。
在上述方案中，第一表面1151正对端盖12的面积较大，从而有足够的面积与端盖12焊接连接，提高了壳体11与端盖12的焊接质量。
如图6所示，在本申请的一些实施例中，端盖12包括本体部121和边缘部122，边缘部122围绕本体部121设置，边缘部122的厚度H4小于本体部121的厚度H3，边缘部122与第一表面1151焊接连接，沿着第一方向P，边缘部122的外边缘的投影落入第一表面1151。
本体部121用于安装第一电能输出部14以及布置注液孔等，边缘部122用于与壳体11焊接连接。边缘部122具有沿着第一方向P面向第一表面1151的第二表面1221。沿着第一方向P，第一表面1151与第二表面1221之间的间隙为焊接区域116，激光射入间隙以通过焊剂将第一表面1151与第二表面1221焊接连接。
边缘部122的外边缘指的是，第二表面1221沿着第三方向Q的外轮廓，下称第二表面1221的外边缘；边缘部122的内边缘指的是，第二表面1221沿着第三方向Q的内轮廓，下称第二表面1221的内边缘。
沿着第一方向P，边缘部122的外边缘的投影落入第一表面1151指的是，第二表面1221的外边缘的投影落入第一表面1151。也就是说，第二表面1221的外边缘落入第一表面1151，第二表面1221的内边缘可以落入第一表面1151，也可以位于第一表面1151的内边缘的内侧。
可以理解的是，沿着第一方向P，第二表面1221的投影可以全部落入第一表面1151，也可以部分落入第一表面1151。例如，在本申请的一些实施例中，第二表面1221的外边缘和内边缘的投影均落入第一表面1151，本体部121的外周面为锥面，本体部121的外周面与开口112的内边缘卡接，以实现第一表面1151与第二表面1221在第一方向P上具有间隙；在本申请的另一些实施例中，由于制造公差的缘故，第一表面1151和第二表面1221的平面度较差，第一表面1151和第 二表面1221抵接时，第一表面1151和第二表面1221之间也可以局部存在间隙，第二表面1221仅有外边缘落入第一表面1151，第二表面1221的内边缘的投影也可以位于第一表面1151之外。
在本申请的一些实施例中，本体部121沿着第一方向P凸出于端盖12的面向壳体11的表面，端盖12的背离壳体11的表面平齐，本体部121的外周侧与开口112的内边缘抵接，以使端盖12覆盖开口112的同时实现第一表面1151和第二表面1221之间具有间隙。在其他实施例中，本体部121也可以凸出于端盖12的背离壳体11的表面，或者，本体部121的面向壳体11的一侧的内部具有凹部，以提高圆柱电池单体10的能量密度。
在上述方案中，沿着第一方向P，边缘部122的外边缘的投影落入第一表面1151，即边缘部122的面向第一表面1151的表面与第一表面1151至少部分正对设置，实现第一表面1151与边缘部122可靠焊接连接，提高了壳体11与端盖12的焊接质量。
在其他实施例中，也可以通过增加边缘部122在第二方向R上的长度，来增加第二表面1221的面积，进而增加第二表面1221与第一表面1151正对的面积，提高边缘部122与第二壁部115的焊接质量。
在本申请的一些实施例中，第二壁部115凸出于第一壁部114的内表面。
如图5和图6所示，沿着第二方向R，第一壁部114的面向壳体11的内部的表面为第一内表面1141，面向壳体11的外部的表面为第一外表面1142，第二壁部115的面向壳体11的内部的表面为第二内表面1152，面向壳体11的外部的表面为第二外表面1153。
第二内表面1152凸出于第一内表面1141，即第二壁部115的内径小于第一壁部114的内径。第一外表面1142和第二外表面1153可以平齐，也可以不平齐。
第二内表面1152在第三方向Q上可以每处均凸出于第一内表面1141，也可以部分凸出于第一内表面1141。
在上述方案中，第二内表面1152凸出于第一内表面1141，不仅能够增加第二壁部115的厚度，且能够减少第二壁部115在同等厚度下第二外表面1153凸出于第一外表面1142的程度，减小由于第二壁部115的厚度增加所导致圆柱电池单体10的外体积增大的程度，提高圆柱电池单体10的能量密度。
在本申请的一些实施例中，第一壁部114的外表面与第二壁部115的外表面平齐。
如图6所示，具体而言，第一外表面1142与第二外表面1153平齐，即第一壁部114的外径与第二壁部115的外径相同。
在上述方案中，由于第一外表面1142与第二外表面1153平齐，在实现第二壁部115的厚度大于第一壁部114的厚度的同时不会增大圆柱电池单体10的外体积，从而提高圆柱电池单体10的能量密度。
图8示出的本申请的一些实施例的第三种形式的圆柱电池单体的壳体的局部结构示意图。
在本申请的一些实施例中，第二壁部115凸出于第一壁部114的外表面。
如图8所示，具体而言，第二外表面1153凸出于第一外表面1142，即第二壁部115的外径大于第一壁部114的外径。第一内表面1141和第二内表面1152可以平齐，也可以不平齐。
在上述方案中，第二外表面1153凸出于第一外表面1142，不仅能够增加第二壁部115的厚度，且能够减少第二壁部115在同等厚度下凸出于第一壁部114的内表面的程度，减小由于第二壁部115的厚度增加所导致圆柱电池单体10的开口112变窄的程度，使电极组件13易于放入壳体11的内部，利于圆柱电池单体10的组装过程。
在本申请的一些实施例中，第一壁部114的内表面与第二壁部115的内表面平齐。
如图8所示，具体而言，第一内表面1141与第二内表面1152平齐，即第一壁部114的内径与第二壁部115的内径相同。
在上述方案中，由于第一内表面1141与第二内表面1152平齐，在实现第二壁部115的厚度大于第一壁部114的厚度的同时维持圆柱电池单体10原有的开口112大小的外体积，使电极组件13易于放入壳体11的内部，利于圆柱电池单体10的组装过程。
图9示出的是本申请的一些实施例的第四种形式的圆柱电池单体的局部结构示意图。
如图9所示，在本申请的一些实施例中，第二壁部115包括基体部1154和过渡部1155，过渡部1155连接于基体部1154和第一壁部114之间，沿背离基体部1154的方向，过渡部1155的厚度逐渐减小。
也就是说，沿着第一方向P，过渡部1155分别具有第一端和第二端，第一端与基体部1154连接，第二端与第一壁部114连接，第一端的厚度H5＝H2，第二端的厚度H5＝H1。沿着第一端指向第二端的方向，H5由H2向H1变化。
可以理解的是，前述的第二壁部115的厚度H2指的是基体部1154的厚度，第二内表面1152和第二外表面1153指的也是基体部1154的面向壳体11内部的表面和面向壳体11外部的表面。
过渡部1155的面向壳体11内部的表面为第三内表面11551，面向壳体11外部的表面为第三外表面11552。过渡部1155沿着第一方向P的厚度变化可以通过第三内表面11551相对于第二内表面1152倾斜设置和/或第三外表面11552相对于第二外表面1153倾斜设置来实现。
在上述方案中，从基体部1154朝向第一壁部114的方向，过渡部1155的厚度逐渐减小，以实现壳体11的基体部1154到第一壁部114的厚度的缓和过渡，不仅使壳体11的外表面和/或内表面圆滑延伸，降低壳体11刮伤电极组件13或者工作人员的可能性，还能够避免基体部1154和第一壁部114的连接处由于厚度骤减而导致结构强度降低，从而使壳体11的结构强度大致均匀，提高了圆柱电池单体10的安全性能。
如图9所示，在本申请的一些实施例中，基体部1154的外表面和过渡部1155的外表面平齐，过渡部1155的内表面相对于基体部1154的内表面倾斜设置。
具体而言，第二外表面1153与第三外表面11552平齐，第三内表面11551相对于第二内表面1152倾斜设置，即过渡部1155的外径与基体部1154的外径相同，过渡部1155的内径大于基体部1154的内径。
第三内表面11551相对于第二内表面1152倾斜设置指的是，第二内表面1152凸出于第一内表面1141，沿着第一方向P，第三内表面11551的一端与第二内表面1152连接，另一端向沿着第二方向R指向壳体11外部的方向延伸，直至与第一内表面1141连接，即沿着从第一端11553指向第二端11554的方向，过渡部1155的内径逐渐增大。
在上述方案中，基体部1154的外表面和过渡部1155的外表面平齐，不会增大圆柱电池单体10的外体积，能够提高圆柱电池单体10的能量密度；过渡部1155的内表面相对于基体部1154的内表面倾斜设置，使壳体11的内表面圆滑延伸，降低壳体11刮伤电极组件13的可能性，提高圆柱电池单体10的安全性能。
如图5和图7所示，在本申请的一些实施例中，第二壁部115沿壳体11的周向(即第三方向Q)延伸一圈。
也就是说，第二壁部115为围绕壳体11的轴线方向(即第一方向P)的闭合的环形。
沿着第三方向Q，第二壁部115的厚度可以相同，也可以不相同。
在上述方案中，由于在壳体11的周向上第二壁部115的厚度均大于第二壁部115的厚度，能够使第二壁部115的面向端盖12的表面在壳体11的周向上正对端盖12的面积均较大，实现壳体11与端盖12在壳体11的周向上的焊接质量均较好。
如图9所示，在本申请的一些实施例中，第一壁部114的厚度为H1，第二壁部115的厚度为H2，满足0.01mm≤H2-H1≤1mm。
也就是说，第二壁部115的厚度H2比第一壁部114的厚度H1厚0.01-1mm。
基于前述的第二壁部115包括基体部1154和过渡部1155的实施方式，将基体部1154的厚度作为第二壁部115的厚度。
H2-H1的最小值为0.1mm，最大值为1mm，例如，H2-H1的值可以为0.1mm、0.2mm、0.4mm、0.6mm、0.8mm、0.9mm等等，对于H2-H1的某一数值，第二壁部115的厚度和第一壁部114的厚度可以有多组数值。
例如，H1＝0.5mm，H2＝0.7mm，H2-H1＝0.2mm；再例如，H1＝0.3mm，H2＝0.4mm，H2-H1＝0.1mm；再例如，H1＝0.8mm，H2＝0.9mm，H2-H1＝0.1mm；再例如，H1＝0.3mm，H2＝0.31mm，H2-H1＝0.01mm；再例如，H1＝0.3mm，H2＝1.3mm，H2-H1＝1mm等等。
在上述方案中，第一壁部114的厚度H1与第二壁部115的厚度H2之间的关系满足上述范围，既能够增加第二壁部115相对于第一壁部114的厚度，使第二壁部115与端盖12可靠地焊接连接，又能够使第一壁部114与第二壁部115的连接处的厚度的变化范围较小，使壳体11的结构强度比较均匀。
如图9所示，在本申请的一些实施例中，沿着第一方向P，第二壁部115的长度为L，满足1mm≤L≤10mm。
基于前述的第二壁部115包括基体部1154和过渡部1155的实施方式，将基体部1154的长度作为第二壁部115的长度。
例如，L＝1mm、3mm、5mm、6mm、7mm、9mm、10mm等。
在上述方案中，第二壁部115沿着第一方向P的长度L满足上述范围，既在第一方向P上具有足够的长度，降低第二壁部115与端盖12焊接过程发热而软化形变的可能性，还能够降低在第一方向P上第二壁部115与第一壁部114的长度比，使壳体11的总重量较薄，满足圆柱电池单体10的轻量化要求。
图10示出的是本申请的一些实施例的圆柱电池单体中体现第二壁部的内径与电极组件的外径关系的示意图。
如图5和图10所示，在本申请的一些实施例中，圆柱电池单体10还包括电极组件13，容纳于壳体11的内部，电极组件13的卷绕轴线沿第一方向P延伸，第二壁部115的内径为D1，电极组件13的外径为D2，满足D1-D2≥0.1mm。
基于前述的第二壁部115包括基体部1154和过渡部1155的实施方式，将基体部1154的内径作为第二壁部115的内径(如图9所示)。
电极组件13的外径为D2指的是，电极组件13在亏电状态下所具有的外径值，也就是在未充电膨胀时所具有的外径值。
例如，D1-D2的值可以为0.1mm、0.3mm、0.5mm、0.7mm、0.9mm、1.2mm、1.5mm、2.5mm、4mm、6mm等等。
作为一种优选的实施方式，0.1mm≤D1-D2≤4mm，不仅易于电极组件13从开口112顺利放入壳体11的内部，且能够使电极组件13与侧壁111的内表面之间的间隙较小，降低电极组件13在第二方向R上的晃动幅度，使圆柱电池单体10内部结构紧凑，能量密度较高。需要提到的是，在垂直于第一方向P的平面上，集流构件15的投影应落入电极组件13的投影，以保证圆柱电池单体10的安全性能。
在上述方案中，第二壁部115的内径D1与电极组件13的外径D2的关系满足上述范围，利于电极组件13从开口112顺利地放入壳体11的内部，利于圆柱电池单体10的组装过程。
在本申请的一些实施例中，开口形成于壳体11沿第一方向P相对的两端，第二壁部115设置有两个，两个第二壁部115位于第一壁部114的两侧，端盖设置有两个，端盖与开口一一对应。
如图3和图4所示，具体而言，两个开口分别为第一开口1121和第二开口1122，第一开口 1121和第二开口1122分别设置于侧壁111沿着第一方向P相对的两侧，两个端盖分别为第一端盖123和第二端盖124，第一端盖123覆盖第一开口1121且与同侧的第二壁部115焊接连接，第二端盖124覆盖第二开口1122且与同侧的第二壁部115焊接连接。可以理解的是，第一端盖123与同侧的第二壁部115的连接方式、第二端盖124与同侧的第二壁部115的连接方式与前述的端盖设置有一个的实施方式中端盖12与第二壁部115的连接方式相同，在此不进一步赘述。
在上述方案中，壳体11沿着第一方向P的两端分别与第一端盖123和第二端盖124焊接连接，壳体11沿着第一方向P的两端分别设有一个第二壁部115，以提高第一端盖123和第二端盖124与壳体11的焊接质量。
本申请的一些实施例提出一种电池100，包括本申请实施例的圆柱电池单体10。
由于本申请实施例的圆柱电池单体10的特性，本申请实施例的电池100也具有较好的安全性能。
本申请的一些实施例提出一种用电装置，包括本申请实施例的电池100，电池100用于提供电能。
由于本申请实施例的电池100的特性，本申请实施例的用电装置也具有较好的安全性能。
图11示出的是本申请的一些实施例的圆柱电池单体中体现圆度不良的端盖与壳体连接的示意图；图12示出的是现有技术中体现圆度不良的端盖与壳体连接的示意图。
如图1至图12所示，本申请的一些实施例提出一种圆柱电池单体10，包括壳体11、端盖12和电极组件13，壳体11包括侧壁111和底壁113，沿着第一方向P，侧壁111的一侧具有开口112，另一侧通过底壁113封闭。进一步地，侧壁111沿着第一方向P具有第一壁部114和第二壁部115，第二壁部115靠近开口112设置，端盖12覆盖开口112时，第二壁部115与端盖12焊接连接。具体而言，端盖12包括本体部121和围绕本体部121周向延伸的边缘部122，第二壁部115的面向端盖12的一侧具有第一表面1151，边缘部122的面向第二壁部115的一侧具有第二表面1221，第一表面1151和第二表面1221沿着第一方向P大致平行设置且之间具有间隙。端盖12与壳体11焊接连接时，激光射入该间隙中，以将端盖12与壳体11焊接连接。
其中，第二壁部115的厚度H2大于第一壁部114的厚度H1，以使第二表面1221与第一表面1151在第一方向P上具有较大的正对面积。也就是说，在端盖12和壳体11的开口112处的圆度不良时，第一表面1151和第二表面1221在第一方向P上具有重叠的部分，端盖12能够完整覆盖开口112，不会在第一方向P上暴露出壳体11内部的空间，在壳体11与端盖12焊接连接的过程中，能够有效避免激光射入壳体11内部并灼伤电极组件13。
形成对比的是，现有技术中，壳体11的开口112处的厚度仍为H1，在端盖12圆度不良的情况下，端盖12不能完全覆盖壳体11的开口112，端盖12的边缘与开口112之间具有第一缝隙1156，暴露出壳体11内部的空间。
如图5所示，在本申请的一些实施例中，壳体11的一侧具有开口112，端盖12具有一个，第二壁部115设置有一个，一个第二壁部115与端盖12焊接连接；如图4所示，在本申请的另一些实施例中，壳体11的两侧分别具有第一开口1121和第二开口1122，端盖具有两个，分别为第一端盖123和第二端盖124，第二壁部115对应设置于两个，两个第二壁部115分别设置于第一壁部114的两侧。
如图6、图8和图9所示，在本申请的一些实施例中，第二壁部115可以通过朝内侧凸出和/或朝外凸出的方式实现其厚度大于第一壁部114的厚度。
如图9所示，在本申请的一些实施例中，第二壁部115包括沿第一方向P设置的基体部1154和过渡部1155，基体部1154和第一壁部114通过过渡部1155连接，基体部1154与端盖12焊接连接，过渡部1155实现基体部1154与第一壁部114的厚度变化的缓和过渡，以使壳体11的内表面和/或外表面圆滑过渡，且壳体11的结构强度比较均匀。基于该种实施方式，第二壁部115的尺寸参数指的是基体部1154的尺寸参数。
在本申请的一些实施例中，0.3mm≤H1≤2mm，0.01mm≤H2-H1≤1mm，1mm≤L≤10mm，D1-D2≥0.1mm。
作为一种示例性的实施例，壳体11的材质为铝，沿着第一方向P，壳体11的两端分别具有第一开口1121和第二开口1122，两个第二壁部115分别位于第一壁部114的两侧，H1＝0.3mm，H2＝0.4mm，L＝5mm。
作为另一种示例性的实施例，壳体11的材质为铝，沿着第一方向P，壳体11的两端分别具有第一开口1121和第二开口1122，两个第二壁部115分别位于第一壁部114的两侧，H1＝0.5mm，H2＝0.7mm，L＝6mm。
作为另一种示例性的实施例，壳体11的材质为钢，沿着第一方向P，壳体11的两端分别具有第一开口1121和第二开口1122，两个第二壁部115分别位于第一壁部114的两侧，H1＝0.8mm，H2＝0.9mm，L＝10mm。
本申请实施例的圆柱电池单体10中，由于第二壁部115的厚度H2大于第一壁部114的厚度H1，能够有效降低焊接台阶，提升焊接效率以及增强焊缝强度，改善圆柱电池单体10由于圆度问题导致的焊接漏激光、偏焊、断焊、爆点等问题，提高圆柱电池单体10的安全性能。
需要说明的是，在不冲突的情况下，本申请中的实施例中的特征可以相互结合。
以上所述仅为本申请的优选实施例而已，并不用于限制本申请，对于本领域的技术人员来说，本申请可以有各种更改和变化。凡在本申请的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本申请的保护范围之内。

Claims (16)

  1. 一种圆柱电池单体，其中，包括：
    壳体，所述壳体的沿第一方向的端部具有开口；
    端盖，覆盖于所述开口；
    其中，所述壳体包括侧壁，所述侧壁包括沿所述第一方向设置的第一壁部和第二壁部，所述第二壁部位于所述第一壁部的靠近所述开口的一侧，所述第二壁部的厚度大于所述第一壁部的厚度，所述第二壁部与所述端盖焊接连接。
  2. 根据权利要求1所述的圆柱电池单体，其中，所述第二壁部具有第一表面，所述第一表面与所述端盖焊接连接，所述第一表面为所述壳体在所述第一方向上的一个端面。
  3. 根据权利要求2所述的圆柱电池单体，其中，所述端盖包括本体部和边缘部，所述边缘部围绕所述本体部设置，所述边缘部的厚度小于所述本体部的厚度，所述边缘部与所述第一表面焊接连接，沿着所述第一方向，所述边缘部的外边缘的投影落入所述第一表面。
  4. 根据权利要求1-3任一项所述的圆柱电池单体，其中，所述第二壁部凸出于所述第一壁部的内表面。
  5. 根据权利要求4所述的圆柱电池单体，其中，所述第一壁部的外表面与所述第二壁部的外表面平齐。
  6. 根据权利要求1-3任一项所述的圆柱电池单体，其中，所述第二壁部凸出于所述第一壁部的外表面。
  7. 根据权利要求6所述的圆柱电池单体，其中，所述第一壁部的内表面与所述第二壁部的内表面平齐。
  8. 根据权利要求1-7任一项所述的圆柱电池单体，其中，所述第二壁部包括基体部和过渡部，所述过渡部连接于所述基体部和所述第一壁部之间，沿背离所述基体部的方向，所述过渡部的厚度逐渐减小。
  9. 根据权利要求8所述的圆柱电池单体，其中，所述基体部的外表面和所述过渡部的外表面平齐，所述过渡部的内表面相对于所述基体部的内表面倾斜设置。
  10. 根据权利要求1-9任一项所述的圆柱电池单体，其中，所述第二壁部沿所述壳体的周向延伸一圈。
  11. 根据权利要求1-9任一项所述的圆柱电池单体，其中，所述第一壁部的厚度为H1，所述第二壁部的厚度为H2，满足0.01mm≤H2-H1≤1mm。
  12. 根据权利要求1-9任一项所述的圆柱电池单体，其中，沿着所述第一方向，所述第二壁部的长度为L，满足1mm≤L≤10mm。
  13. 根据权利要求1-12任一项所述的圆柱电池单体，其中，所述圆柱电池单体还包括：
    电极组件，容纳于所述壳体的内部，所述电极组件的卷绕轴线沿所述第一方向延伸，所述第二壁部的内径为D1，所述电极组件的外径为D2，满足D1-D2≥0.1mm。
  14. 根据权利要求1-13任一项所述的圆柱电池单体，其中，所述开口形成于所述壳体沿所述第一方向相对的两端，所述第二壁部设置有两个，两个所述第二壁部位于所述第一壁部的两侧，所述端盖设置有两个，所述端盖与所述开口一一对应。
  15. 一种电池，其中，包括如权利要求1-14任一项所述的圆柱电池单体。
  16. 一种用电装置，其中，包括如权利要求15所述的电池，所述电池用于提供电能。
PCT/CN2022/098262 2022-06-10 2022-06-10 圆柱电池单体、电池以及用电装置 Ceased WO2023236218A1 (zh)

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